Implement advancing next branch to next commit on dev branch

Uses gix to invoke git commands as there is not API to directly update
the position of a branch.

Closes kemitix/git-next#14

Cargo.toml

@@ -17,6 +17,9 @@ tracing-subscriber = "0.3"
 # base64 decoding
 base64 = "0.22"
 
+# git
+gix = "0.61"
+
 # fs/network
 kxio = "0.1" # { git = "https://git.kemitix.net/kemitix/kxio.git", branch = "main" }
 

src/server/actors/repo/branch.rs

@@ -67,21 +67,70 @@ pub async fn validate_positions(
         return;
     }
     let dev = commit_histories.dev[0].clone();
-    addr.do_send(StartMonitoring { main, next, dev });
+    addr.do_send(StartMonitoring {
+        main,
+        next,
+        dev,
+        dev_commit_history: commit_histories.dev,
+    });
 }
 
 // advance next to the next commit towards the head of the dev branch
-#[allow(dead_code)]
 pub async fn advance_next(
-    _next: forge::Commit,
-    _repo_details: config::RepoDetails,
+    next: forge::Commit,
+    dev_commit_history: Vec<forge::Commit>,
+    repo_details: config::RepoDetails,
+    repo_config: config::RepoConfig,
     addr: Addr<RepoActor>,
-    _net: network::Network,
 ) {
-    // TODO: (#14) advance next one commit towards dev
     info!("Advance Next");
+    let user = repo_details.forge.user;
+    let token = repo_details.forge.token;
+    let hostname = repo_details.forge.hostname;
+    let path = repo_details.repo;
+    let next_commit = find_next_commit_on_dev(next, dev_commit_history);
+    let Some(commit) = next_commit else {
+        warn!("No commits to advance next to");
+        return;
+    };
+    let next = repo_config.branches().next();
+    let command =
+        format!("/usr/bin/git push https://{user}:{token}@{hostname}/{path}.git {commit}:{next}");
+    info!("Running command: {}", command);
+    match gix::command::prepare(command)
+        .with_shell_allow_argument_splitting()
+        .spawn()
+    {
+        Ok(mut child) => {
+            match child.wait() {
+                Ok(exit_status) => {
+                    info!(%exit_status, "Advance Next Success");
                     addr.do_send(StartRepo);
                 }
+                Err(err) => {
+                    warn!(?err, "Advance Next Failed (wait)")
+                }
+            };
+        }
+        Err(err) => {
+            warn!(?err, "Advance Next Failed (spawn)")
+        }
+    };
+}
+
+fn find_next_commit_on_dev(
+    next: forge::Commit,
+    dev_commit_history: Vec<forge::Commit>,
+) -> Option<forge::Commit> {
+    let mut next_commit: Option<forge::Commit> = None;
+    for commit in dev_commit_history.into_iter() {
+        if commit == next {
+            break;
+        };
+        next_commit.replace(commit);
+    }
+    next_commit
+}
 
 // advance main branch to the commit 'next'
 #[allow(dead_code)]
@@ -95,3 +144,21 @@ pub async fn advance_main(
     info!("Advance Main");
     addr.do_send(StartRepo);
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[actix_rt::test]
+    async fn test_find_next_commit_on_dev() {
+        let next = forge::Commit::new("current-next");
+        let dev_commit_history = vec![
+            forge::Commit::new("dev"),
+            forge::Commit::new("dev-next"),
+            forge::Commit::new("current-next"),
+            forge::Commit::new("current-main"),
+        ];
+        let next_commit = find_next_commit_on_dev(next, dev_commit_history);
+        assert_eq!(next_commit, Some(forge::Commit::new("dev-next")));
+    }
+}

src/server/actors/repo/mod.rs

@@ -5,7 +5,7 @@ mod webhook;
 
 use actix::prelude::*;
 use kxio::network::Network;
-use tracing::info;
+use tracing::{info, warn};
 
 use crate::server::{
     config::{RepoConfig, RepoDetails},
@@ -86,22 +86,35 @@ pub struct StartMonitoring {
     pub main: forge::Commit,
     pub next: forge::Commit,
     pub dev: forge::Commit,
+    pub dev_commit_history: Vec<forge::Commit>,
 }
 impl Handler<StartMonitoring> for RepoActor {
     type Result = ();
     fn handle(&mut self, msg: StartMonitoring, ctx: &mut Self::Context) -> Self::Result {
         info!("Monitoring started");
-        let next_ahead_of_main = msg.main != msg.next;
-        let dev_ahead_of_next = msg.next != msg.dev;
+        let Some(repo_config) = self.config.clone() else {
+            warn!("No config loaded");
+            return;
+        };
+
         let repo_details = self.details.clone();
         let addr = ctx.address();
         let net = self.net.clone();
+
+        let next_ahead_of_main = msg.main != msg.next;
+        let dev_ahead_of_next = msg.next != msg.dev;
         if next_ahead_of_main {
             status::check_next(msg.next, repo_details, addr, net)
                 .into_actor(self)
                 .wait(ctx);
         } else if dev_ahead_of_next {
-            branch::advance_next(msg.next, repo_details, addr, net)
+            branch::advance_next(
+                msg.next,
+                msg.dev_commit_history,
+                repo_details,
+                repo_config,
+                addr,
+            )
             .into_actor(self)
             .wait(ctx);
         } else if self.webhook_id.is_none() {

src/server/actors/repo/status.rs

@@ -34,9 +34,7 @@ pub async fn check_next(
 
 #[derive(Debug)]
 pub enum Status {
-    #[allow(dead_code)] // TODO: (#13) remove this when we have results from the forge
     Pass,
-    #[allow(dead_code)] // TODO: (#13) remove this when we have results from the forge
     Fail,
     Pending,
 }

src/server/forge/mod.rs

@@ -13,6 +13,14 @@ pub struct CommitHistories {
 pub struct Commit {
     pub sha: String,
 }
+impl Commit {
+    #[cfg(test)]
+    pub fn new(sha: &str) -> Self {
+        Self {
+            sha: sha.to_string(),
+        }
+    }
+}
 impl Display for Commit {
     fn fmt(&self, f: &mut Formatter) -> std::fmt::Result {
         write!(f, "{}", self.sha)